72 BRITISH ICHNEUMONS. [ Stenomacrus 

Generally it is a little larger and stouter than S. agzl’s, to which it is 
very similar though constantly differing in the emission of the radial 
nervure from almost the apical third of the stigma; it has doubtless been 
much mixed with it in Britain. 
Swedish woods in August (Holmgren) and Prussia (Brischke) ; and cer- 
tainly not very rare with us. First recorded from Cornworthy in Devon 
in the middle of July by Bignell, who also took it at Clearbrook in the 
same county in the middle of August; Marshall found several at Corn- 
worthy, a at Bishops Teignton in Devon, anda ¢ at Govilon in Mon- 
mouth. Beaumont has given me males (named O. agi/is by Marshall) 
from Enniscorthy in Ireland and a 9 from Taynuilt in Scotland, both 
taken early in September; Dr. Capron found the same sex in Surrey. 
Two probably hibernated 9 @ occurred to me by beating Pinus sylvestris 
in the Bentley Woods, near Ipswich, on 2nd April, 1899. 
10. agilis, Holmer. 
Orthocentrus agilis, Holmgr. Sv. Ak. Handl. 1855, p. 337, ¢ @; Brisch. Schr. 
Nat. Ges. Danz. 1878, p.109, ¢ (mec 1871). Stenomacrus agilis, Thoms. O. E. 
xxil. 2439, ?. 
Shining, punctulate and dark piceous. Head of ¢ flavous with the 
vertex and frons to a little below its centre alone nigrescent, of 9 black 
or piceous with the mouth, face, genal apices and apical margin of frons 
testaceous; apical joint of maxillary palpi somewhat shorter than penulti- 
mate. Antennae filiform and basally pale; of ¢ flavescent and as long as 
the body, of @ a little shorter and rufo-testaceous, in both apically infus- 
cate with the scape and basal flagellar joint of equal length. Thorax 
nigrescent with the prothorax, pleurae and sternum rufescent; areola 
wanting though basally indicated; petiolar area entire. Scutellum and 
postscutellum of ¢ testaceous, latter in 9 sometimes fulvescent. Abdo- 
men narrow and badious, of ? apically compressed and of g sometimes 
discally pale-marked; two basal segments aciculate, with the first usually 
black; venter pale; terebra not reflexed, black and shortly exserted; 
styles elongate. Legs testaceous; ¢ with anterior coxae and trochanters 
whitish. Wings with tegulae whitish and areolet wanting. Length, 
24—3 mm. 
A third smaller than S. rédibundus and more slender, with the second 
segment longer and body paler; of the size of S. celery and similar, but 
with the palpal and second segmental structure different; more like 
S. exis, but much longer and at once known by its colouration and 
markings ; says Holmgren. 
In damp meadows in Sweden, during August, France, and in Prussia. 
It is recorded by Bignell from Ivybridge in Devon on zoth August, but 
must be considered doubtfully British, since specimens named by Mar- 
shall certainly belong to the last-described species, and I possess nothing 
but one extremely doubtful male from Piffard’s Herts. collection, having 
the second recurrent nervure quite continuous with the submarginal and 
the thorax immaculate black. Brischke in 1871 gives this species as 
parasitic upon the Heteromerous beetle, He/edona agaricola, but in 1878 he 
describes it as a new species, O. /es/acerpes ; it cannot be S. agilis since, as 
Thomson points out (/.c.), the areolet is entire. 
